Firefox does not recognize a redirect for my website

I have a business website and I have two domain names. I've set up a redirect but it's not working with Firefox. It works well in Internet Explorer. How do I fix this so that Firefox users will be redirected to my website?

URL of affected sites

I have a business website and I have two domain names. I've set up a redirect but it's not working with Firefox. It works well in Internet Explorer. How do I fix this so that Firefox users will be redirected to my website?
== URL of affected sites ==
http://www.atstractorservices.com